Improvement im machines for grinding saw-blades



' 2 Sheets-- Sheet1.

c. H. COLBY.

Improvement in Machines for Polishing Saw-Blades.

Patented Nov. 12,1872.

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c; HQCOLBY.

Improvement in Machines for Polishing Saw-Blades.

Patented Nov. 12, 1872.

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WMIWJJOS', dmwnwb A M. PHHTO-LITHOGHAPHIC C0. N- T/GSBORNES PROCESSUNITED CHARLES H. COLBY, OF BROOKLYN, ASSIGNOR TO HIMSELF AND GEORGE--WALL, OF XVILLIAMSBURG, NEW YORK.

IMPROVEMENT IN MACHINES FOR GRINDlNG SAW-BLADES.

Specification forming part of Letters Patent No. 132,9, dated November12, 1872.

To all whom it may concern:

Be it known that I, CHARLES H. COLBY, of Brooklyn, in the county ofKings and in the State of New York, have invented certain new and usefulImprovements in Machines for Polishing Saw-Blades and do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompanying drawing making a part of thisspecification, in which Figure 1 is a perspective view of my improvedmachine, and Fig. 2 is a vertical central section of the same on a lineextending from front to rear.

Letters of like name and kind refer to like parts in each of thefigures.

The object of my invention is to produce a machine which, while capableof grinding or polishing saw-plates in a rapid and thorough manner,shall also enable the abrasive material employed to be collected,returned to the hopper, and again used; and to this end said inventionconsists, principally, in the construction and combination of thegrinding or polishingdevices with the apparatus employed for moving thesaw-plates through the same, substantially as and for the purposehereinafter specified. It consists, further, in the means employed forseparating the abrasive material from the saw-plates and conveying thesame to the supply reservoir or hopper, substantially as and for thepurpose hereinafter shown. It consists, further, in the means employedfor removing the fine dust from the abrasive material, substantially asand for the purpose hereinafter set forth. It consists, further, in themeans employed for effecting the vertical adjustment of the revolvingbed or support upon which the saw-blades rest while being operated upon,substantially as and for the purpose hereinafter specified. It consists,finally, in the device as a whole, when its various parts areconstructed and combined substantially as and for the purposehereinafter shown and described.

In the annexed drawing, A, B, and 0 represent three vertical postsconnected together at their lower ends by means of a sill, D, and at ornear their upper ends by two horizontal bars, E and F, respectively, thewhole forming one side of the frame of the machine, which side issuitably connected to or with a similar raising the pivoted frame.

part by means of a number of cross-bars and braces, G and H,respectively. J our-naled within suitable boxes I, which rest upon andare secured to the bar E, is a shaft, K, upon which is secured a hollowdrum,L, that is constructed with substantially the relative dimensionsshown, and upon its periphery is covered with leather or other suitablesubstance for receivin g and containing the abrasive material. Pivotedat one end to or upon the post B, at a pointmidway between the sill Dand the periphery of the drum L, is a bar, M, which from thence extendshorizontally forward to or near the post A, and at said forward end isconnected with a similar bar, M, placed upon the opposite side of themachine by means of a cross-bar, N, the whole forming a pivoted frame,which is so arranged as to permit its free end to be elevated ordepressed. The lower side'of the bar N rests upon and is supported by aroller, 0, which roller is flattened upon its upper side and rests insuitable bearings 0 that are secured to and rest upon the sill D. Asthus arranged it will be seen that by rotating the roller 0 so as tochange the angle of its flattened upper side the bar N and the pivotedframe will be raised, while by restoring said roller to its formerposition, with said flattened portion horizontal, the end of saidpivoted frame will drop downward to and occupy the lowest possibleposition. A bar, P, extending upward and forward from the roller 0,enables the latter to be manipulated at will. The object of the pivotedframe is to furnish a support for a revolving bed upon which to rest thesaw-plates, which bed consists of a drum or roller, Q, that is providedwith a central shaft, g, which rests in suitable boxes R that are placedupon the bars M directly beneath the center of the drum shaft K. Thediameter of the roller Q is such as to leave between its periphery andthe corresponding portion of the drum L a sufficient space to containany desired thickness of saw-plate, which space is decreased at will,and said sawplate caused to bear against said drum by The upwardmovement of the pivoted frame is limited by means of a set-screw, S,upon each side of the machine, which screws pass downward throughsuitable threaded openings formed in projecting lugs s, and have theirlower ends immediatel y above the forward ends of the bars M, in whichposition said screws receive and arrest the motion of said bars when thelatter are raised, so that by varying the positions of the former thedegree of movement of the bars and the revolving bed Q is determined. Inorder that the saw-blades may be caused to pass with the desired rate ofspeed beneath the drum I1, two feed-rollers, T, are suitably journaledupon the forward faces of the posts A and B, in such positions as-tocause their lines of contactand division to coincide horizontally withthe corresponding features of the drum and revolving bed. These rollersare made adjustable toward or from each other vertically, and the upperrollers of each pair are caused to revolve downward and rearwardby'means of suitable pulleys t, which are attached to the projectingends of their shafts, and are connected with the operating-shaft T bybelts U, or by any equivalent means. As

thus arranged, the drum L is supplied with a suitable coating ofabrasive material and caused to rotate rapidly, while the saw-blades arecaused to pass between said drum and the revolving bed Q by means of thefeed-rollers, by which operation the upper surfaces of said saw-bladesare exposed to the action of said abrasive material, and uniformlyground or polished. As the abrasive or polishing material requires to beconstantly applied to the surface of the drum, a hopper, V, having thegeneral form shown iii-Fig. 1, is suspended to or from the front side ofthe posts A, in such position as to cause it to inclose the forward sideof said drum without being in actual contact with the same, the loweropen end of said hopper being extended well beneath said drum. Into thishopper is poured the abrasive material, and its flow therefrom regulatedby means of a butterfly-valve, W, which valve 1s opened or closed by alever, 10, that is connected to or with the projecting end of itsjournal, and extending upward engages with a toothed rack, X. Bypressing the upper end of the lever 10 outward so as to release it fromengagement with the rack X, said lever may bemoved toward the front orrear of the machine, and the valve correspondingly opened or closed. Inpassing through the machine, the abrasive material is but slightlyinjured, so that it has been found economical to collect the same andpass it through the hopper and machine several times. To accomplish thisresult, the following described mechanism is employed: Resting upon thehorizontal bars F and cross-bar G is a circular tray, Y, which has asunk perforated central portion, and at its center is provided with ahollow boss, 3 that forms a socket for a pointed stud, Z, which stud,extending upward into said boss, forms a central bearing for said tray.Immediately over the tray Y is placed a plate of sheet metal, A, that isprovided at its sides and rear end with upturned edges a, and extendsforward between the posts B to or near the upper side of the lowercontiguous roller '1, so as to receive from the same the saw-blade andany loose abrasive material which may pass rearward with the same. Aseries of perforations formed in and through the plate A, within thecircle of the tray Y, enables said abrasive material to pass downwardinto the latter, from whence it falls through the openings into a metaltray, B, suspended beneath and from the same. From the tray 13 theabrasive material is conveyed by means of. a spout, G, into a reservoir,D, that is attached to the lower end and side of one of the posts A, andfrom thence by means of an elevator-band, E, provided with suitable cups6, into a trough, F, that empties into the hopper. In order that theabrasive material may be caused to pass more readily from the trays Yand B, a lever, G, is pivoted at one end to or upon one edge of saidtray Y, and atits opposite or lower end upon the outer face of the sillD, immediately beneath. A connecting-bar, H, is pivoted at one end to orupon the lever G, just above its center, and has its opposite endjournaled upon a crank-pin, I, that extends horizontally outward from apulley, K, which, is secured to or upon the driving-shaft. Asthusarranged a rotary motion of the driving-shaft is communicatedthrough the connecting-bar and pivoted lever to the trays, and gives tothe same an oscillating motion upon its pivotal'bearing, which motionnot only causes the abrasive material to pass through the upper tray,but also to pass freely from the lower tray into the spout. A plate, L,extending horizontally rearward from the feed-rollers at a point justbelow their common center, furnishes a guide for both the saw-blades andfor the abrasive material, while -a second plate, M, extending forwardin like manner from the centers of the rear feed-rollers,

with its forward edge resting upon the periphcry of the revolving bed,scrapes from the latter any adhering abrasive material and guides thesame and said saw-blades into and through said rollers. In order thatthe abrasive material may be freed from dust and returned to the hopperin a clean condition, four or more radial wings, N, are affixed to oneend of the polishing-drum, and are inclosed by means of a metal casing,0, which is attached to and supported by the frame of the machine. Anopening, 1?, formed within the face of the casing admits air to itsinterior, while from the lower side of said casing extends downward andrearward a pipe, Q, which pipe is provided at its lower end with across-pipe, q, that extends across the front side of the lower tray B. Aseries of perforations in the rear side of the cros3-pipe permits theescape therefrom of air, which, passing through the abrasive material,removes from the same any dust or light impurities. A valve may beplaced within the air-pipe for the purpose of regulating the force ofthe current of air. A shield or cover, R, placed over the upper and rearside of the polishing-drum, completes the device, whieh, when its partsare properly adjusted, will perform the desired officein the mostperfect manner and with great rapidity; while, at the same time, butslight attention is required, and comparatively unskilled labor isrendered available in the operation of the machine.

Having thus fully set forth the nature and merits of my invention, whatI claim as new is- 1. In combination with the drum L and revolving-bedQ, the feed-rollers T and their operating mechanism, when said parts areconstructed and relatively arranged substantially as and for the purposespecified.

2. The trays Y. and B, the perforated plate A',the spout O, thereservoir D, the elevator E and e, the trough F, the lever G, theconnection H, and the crank-pin I, when said parts are combined witheach other and with the polishing or grinding mechanism substantially asand for the purpose shown.

3. In combination with the means employed for returning the abrasivematerial to the hopper, the radial wings N attached to and re volvingwith the drumL, the shield 0 provided with the opening P, and the pipe Qprovided with the perforated cross-pipe q, substantially as and for thepurpose set forth.

4. In combination with the pivoted frame of the revolving drum or bed Q,the roller 0 provided with a flattened upper surface and capable ofrotation within its bearings, substantially as and for the purposespecified.

5. The device as a whole, when its several parts are constructed andcombined substantially as and for the purpose shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this6th day of September, 1872.

- CHARLES H. COLBY. Witnesses:

GEO. S. PRINDLE, EDM. F. BROWN.

